combine vs meld

combine and meld both are nouns.

Word	Noun	Adjective	Verb	Adverb
combine	Yes	No	Yes	No
meld	Yes	No	Yes	No

As verbs, combine and meld are synonyms defined as:

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

As verbs, meld is a hyponym of combine; that is, meld is a word with a more specific, narrower meaning than combine:

combine (noun)	meld (noun)
harvester that heads and threshes and cleans grain while moving across the field	a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank
an occurrence that results in things being united
a consortium of independent organizations formed to limit competition by controlling the production and distribution of a product or service

combine (verb)	meld (verb)
mix together different elements	mix together different elements
put or add together	lose its distinct outline or shape; blend gradually
combine so as to form a whole; mix	announce for a score; of cards in a card game
gather in a mass, sum, or whole
add together from different sources
join for a common purpose or in a common action
have or possess in combination