negotiate vs hash out

negotiate and hash out both are verbs.

Word	Noun	Adjective	Verb	Adverb
negotiate	No	No	Yes	No
hash out	No	No	Yes	No

As verbs, hash out is a hypernym of negotiate; that is, hash out is a word with a broader meaning than negotiate:

negotiate: discuss the terms of an arrangement
hash out: speak with others about (something); talk (something) over in detail; have a discussion

Other hypernyms of negotiate include discuss, talk over.

negotiate (verb)	hash out (verb)
discuss the terms of an arrangement	speak with others about (something); talk (something) over in detail; have a discussion
succeed in passing through, around, or over