infix vs enter

infix is a noun but enter is not a noun.

Word	Noun	Adjective	Verb	Adverb
infix	Yes	No	Yes	No
enter	No	No	Yes	No

As verbs, infix and enter are synonyms defined as:

Other synonyms of infix include insert, introduce.

infix (noun)	enter (noun)
an affix that is inserted inside the word

infix (verb)	enter (verb)
attach a morpheme into a stem word	set out on (an enterprise or subject of study)
put or introduce into something	make a record of; set down in permanent form
	become a participant; be involved in
	put or introduce into something
	come on stage
	to come or go into
	take on duties or office
	register formally as a participant or member
	be or play a part of or in