merge vs blend

merge is not a noun while blend is a noun.

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

As verbs, merge and blend are synonyms defined as:

Other synonyms of merge include coalesce, combine, commingle, conflate, flux, fuse, immix, meld, mix.

merge (noun)	blend (noun)
	the act of blending components together thoroughly
	a new word formed by joining two others and combining their meanings
	an occurrence of thorough mixing

merge (verb)	blend (verb)
become one	mix together different elements
mix together different elements	combine into one
join or combine	blend or harmonize