entry vs admittance

entry and admittance both are nouns.

Word	Noun	Adjective	Verb	Adverb
entry	Yes	No	No	No
admittance	Yes	No	No	No

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

entry (noun)	admittance (noun)
the act of entering	the act of admitting someone to enter
the act of beginning something new	the right to enter
something that provides access (to get in or get out)
something (manuscripts or architectural plans and models or estimates or works of art of all genres etc.) submitted for the judgment of others (as in a competition)
an item inserted in a written record
a written record of a commercial transaction