forehand vs forehanded

forehand is a noun but forehanded is not a noun.

Word	Noun	Adjective	Verb	Adverb
forehand	Yes	Yes	No	No
forehanded	No	Yes	No	No

As adjectives, forehand and forehanded are synonyms defined as:

forehand and forehanded: (of racket strokes) made with palm facing direction of stroke

forehand (noun)	forehanded (noun)
(sports) a return made with the palm of the hand facing the direction of the stroke (as in tennis or badminton or squash)

forehand (adjective)	forehanded (adjective)
(of racket strokes) made with palm facing direction of stroke	(of racket strokes) made with palm facing direction of stroke
	having provided for the future