anatomist vs osteologer

anatomist and osteologer both are nouns.

Word	Noun	Adjective	Verb	Adverb
anatomist	Yes	No	No	No
osteologer	Yes	No	No	No

As nouns, osteologer is a hyponym of anatomist; that is, osteologer is a word with a more specific, narrower meaning than anatomist:

Other hyponyms of anatomist include comparative anatomist, histologist, osteologist.

anatomist (noun)	osteologer (noun)
an expert in anatomy	an anatomist who is skilled in osteology