blend vs merge

blend is a noun but merge is not a noun.

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

As verbs, blend and merge are synonyms defined as:

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

blend (noun)	merge (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

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