portmanteau vs portmanteau word

portmanteau and portmanteau word both are nouns.

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

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

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

Other synonyms of portmanteau include blend.

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