portmanteau vs neology

portmanteau and neology both are nouns.

Word	Noun	Adjective	Verb	Adverb
portmanteau	Yes	No	No	No
neology	Yes	No	No	No

As nouns, neology is a hypernym of portmanteau; that is, neology is a word with a broader meaning than portmanteau:

portmanteau: a new word formed by joining two others and combining their meanings
neology: a newly invented word or phrase

Other hypernyms of portmanteau include coinage, neologism.

portmanteau (noun)	neology (noun)
a large travelling bag made of stiff leather	the act of inventing a word or phrase
a new word formed by joining two others and combining their meanings	a newly invented word or phrase