Nouns for hobbies such as collecting. I assume that there is a specific term for these sorts of words but I have not been able to find it. Overwhelmingly these are neo-classical coinages.

Collecting

termpractitionermorphologyobject
arctophilyarctophilistGk. arktos (bear) + philos (love)teddy bears
arenophilyarenophileL. arena (sand) + Gk. philos (love)sand samples
bibliomaniabibliomaniacGk. biblion (book) + mania (obsession)books
brandophilybrandophilistDu. brand (burning mark) + Gk. philoscigar bands
cartophilycartophilistL. charta (paper, card) + Gk. philoscigarette cards & trade cards
conchologyconchologistGk. konkhē (shell) + logos (study)shells
copoclephilycopoclephilistGk. kope (handle) + kleis (key) + philoskeychains
deltiologydeltiologistGk. deltion (small writing tablet)postcards
ephemeraphilyephemeraphilistGk. ephēmeros (lasting a day) + philosephemera: pamphlets, tickets, flyers
exlibrisophilyexlibrisophilistL. ex libris (from the books of)bookplates
faleristics / phaleristicsfalerist / phaleristL. phalerae (metal decorations), from Gk. φάλαρα (ornamental disc)medals, badges, orders, decorations
fusilatelyfusilateristL. fusus (spindle, wire) + philatelyphone cards
incunabulismincunabulistL. incunabula (cradle; earliest printed books)books printed before 1501
labeorphilylabeorphilistL. labrum (lip/edge) + Gk. philosbeer bottle labels
lepidopterologylepidopterologistGk. lepis (scale) + pteron (wing)butterflies & moths (also their study)
lithophilylithophileGk. lithos (stone) + philos (love)stones & rocks
lotologylotologistlottery + Gk. logos (study) — hybrid coinagelottery tickets
notaphilynotaphilistL. nota (note) + Gk. philos (love)paper banknotes (distinct from numismatics)
numismaticsnumismatistGk. nomisma (coin, currency)coins & currency (also their study)
oologyoologistGk. ōon (egg) + logosbird eggs (now largely illegal)
pannapictagraphypannapictagraphistL. panna (cloth?) + picta (painted) + Gk. graphē (image) — etymology disputedcomic books
philatelyphilatelistGk. philos (love) + ateleia (tax-free)stamps
phillumenyphillumenistGk. philos (love) + L. lumen (light)matchbooks & matchbox labels
philographyphilographerGk. philos (love) + graphē (writing)autographs
plangonologyplangonologistGk. plangōn (wax doll used as theatrical female stand-in) + logosdolls
planophilyplanophilistGk. planos (wandering) + philos (love)transit tickets & passes
scripophilyscripophilistL. scriptum (written) + Gk. philosold stock certificates & bonds
sucrologiesucrologueL. sucrum (sugar) (French coinage used in English)sugar packets
tegestologytegestologistL. teges (mat, covering)beer mats / coasters
tyrosemiophilytyrosemiophilistGk. tyros (cheese) + sēmeion (sign/label)cheese labels
vecturismvecturistL. vectura (fare, transport)transit tokens (distinct from planophily)
velologyvelologistacronym VEL (Vehicle Excise Licence) + Gk. logosUK vehicle tax discs (1921–2014)

Study

termpractitionermorphologyobject
anthroponymyanthroponymistgk. anthrōpos (human) + onoma (name)personal names
campanologycampanologistl. campana (bell) + logosbell ringing
cetologycetologistgk. kētos (whale) + logoswhales
cruciverbalismcruciverbalistl. crux (cross) + verbum (word)crossword construction (& solving)
iconologyiconologistgk. eikōn (image) + logossymbols & icons in art
malacologymalacologistgk. malakos (soft) + logosmollusks
mycologymycologistgk. mykēs (fungus) + logosfungi (also used by mushroom-hunting enthusiasts)
oenologyoenologistgk. oinos (wine) + logoswine
onomasticsonomasticiangk. onoma (name) + -ikosnames generally (umbrella for toponymy, anthroponymy, etc.)
pteridologypteridologistgk. pteris (fern) + logosferns
sabermetricssabermetriciansabr (society for american baseball research) + metricsstatistical analysis of baseball
taphonomytaphonomistgk. taphos (grave) + nomos (law)what happens to organisms after death
toponymytoponymistgk. topos (place) + onoma (name)place names
trichologytrichologistgk. thrix (hair) + logoshair
vexillologyvexillologistl. vexillum (flag)flags
zymurgyzymurgistgk. zymē (leaven) + ergon (work)fermentation, esp. brewing
arenophilyarenophileL. arena (sand) + Gk. philos (love)sand samples
faleristics / phaleristicsfalerist / phaleristL. phalerae (metal decorations), from Gk. φάλαρα (ornamental disc)medals, badges, orders, decorations
lotologylotologistlottery + Gk. logos (study) — hybrid coinagelottery tickets
pannapictagraphypannapictagraphistL. panna (cloth?) + picta (painted) + Gk. graphē (image) — etymology disputedcomic books
plangonologyplangonologistGk. plangōn (wax doll used as theatrical female stand-in) + logosdolls
velologyvelologistacronym VEL (Vehicle Excise Licence) + Gk. logosUK vehicle tax discs (1921–2014)