blend vs portmanteau

blend and portmanteau both are nouns.

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

As nouns, blend and portmanteau are synonyms defined as:

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

Other synonyms of blend include portmanteau word.

blend (noun)	portmanteau (noun)
the act of blending components together thoroughly	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
an occurrence of thorough mixing

blend (verb)	portmanteau (verb)
mix together different elements
combine into one
blend or harmonize