outspoken vs plainspoken

outspoken and plainspoken both are adjectives.

Word	Noun	Adjective	Verb	Adverb
outspoken	No	Yes	No	No
plainspoken	No	Yes	No	No

As adjectives, outspoken and plainspoken are synonyms defined as:

outspoken and plainspoken: characterized by directness in manner or speech; without subtlety or evasion

Other synonyms of outspoken include blunt, candid, forthright, frank, free-spoken, point-blank, straight-from-the-shoulder.

outspoken (adjective)	plainspoken (adjective)
given to expressing yourself freely or insistently	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