portmanteau vs suitcase

portmanteau and suitcase both are nouns.

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

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

Other hypernyms of portmanteau include bag, grip, traveling bag, travelling bag.

portmanteau (noun)	suitcase (noun)
a large travelling bag made of stiff leather	a portable rectangular container for carrying clothes
a new word formed by joining two others and combining their meanings