portmanteau word vs portmanteau

portmanteau word and portmanteau both are nouns.

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

As nouns, portmanteau word and portmanteau are synonyms defined as:

portmanteau word and portmanteau: a new word formed by joining two others and combining their meanings

Other synonyms of portmanteau word include blend.

portmanteau word (noun)	portmanteau (noun)
a new word formed by joining two others and combining their meanings	a large travelling bag made of stiff leather
	a new word formed by joining two others and combining their meanings