plainspoken vs straight-from-the-shoulder

plainspoken and straight-from-the-shoulder both are adjectives.

Word	Noun	Adjective	Verb	Adverb
plainspoken	No	Yes	No	No
straight-from-the-shoulder	No	Yes	No	No

As adjectives, plainspoken and straight-from-the-shoulder are synonyms defined as:

plainspoken and straight-from-the-shoulder: characterized by directness in manner or speech; without subtlety or evasion

Other synonyms of plainspoken include blunt, candid, forthright, frank, free-spoken, outspoken, point-blank.

plainspoken (adjective)	straight-from-the-shoulder (adjective)
characterized by directness in manner or speech; without subtlety or evasion	characterized by directness in manner or speech; without subtlety or evasion
using simple and direct language