pullover vs slipover

pullover and slipover both are nouns.

Word	Noun	Adjective	Verb	Adverb
pullover	Yes	No	No	No
slipover	Yes	No	No	No

As nouns, pullover and slipover are synonyms defined as:

pullover and slipover: a sweater that is put on by pulling it over the head

pullover (noun)	slipover (noun)
a sweater that is put on by pulling it over the head	a sweater that is put on by pulling it over the head