only vs entirely

only is an adjective but entirely is not an adjective.

Word	Noun	Adjective	Verb	Adverb
only	No	Yes	No	Yes
entirely	No	No	No	Yes

As adverbs, only and entirely are synonyms defined as:

Other synonyms of only include alone, exclusively, solely.

only (adjective)	entirely (adjective)
exclusive of anyone or anything else
being the only one; single and isolated from others

only (adverb)	entirely (adverb)
with nevertheless the final result	to a complete degree or to the full or entire extent; Completely or entirely
without any others being included or involved	without any others being included or involved
and nothing more
never except when
in the final outcome
as recently as
except that