neophyte vs newbie

neophyte and newbie both are nouns.

Word	Noun	Adjective	Verb	Adverb
neophyte	Yes	No	No	No
newbie	Yes	No	No	No

As nouns, neophyte and newbie are synonyms defined as:

Other synonyms of neophyte include entrant, fledgeling, fledgling, freshman, newcomer, starter.

neophyte (noun)	newbie (noun)
any new participant in some activity	any new participant in some activity
a new convert being taught the principles of Christianity by a catechist
a plant that is found in an area where it had not been recorded previously