foursquare vs straightforwardly

foursquare is a noun but straightforwardly is not a noun.

Word	Noun	Adjective	Verb	Adverb
foursquare	Yes	Yes	No	Yes
straightforwardly	No	No	No	Yes

As adverbs, foursquare and straightforwardly are synonyms defined as:

foursquare and straightforwardly: with firmness and conviction; without compromise

Other synonyms of foursquare include squarely.

foursquare (noun)	straightforwardly (noun)
(geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon

foursquare (adjective)	straightforwardly (adjective)
characterized by firm and unwavering conviction

foursquare (adverb)	straightforwardly (adverb)
with firmness and conviction; without compromise	with firmness and conviction; without compromise
in a square position