backhand vs left-slanting

backhand is a noun but left-slanting is not a noun.

Word	Noun	Adjective	Verb	Adverb
backhand	Yes	Yes	Yes	No
left-slanting	No	Yes	No	No

As adjectives, backhand and left-slanting are synonyms defined as:

backhand and left-slanting: (of handwriting) having the letters slanting backward

backhand (noun)	left-slanting (noun)
a return made with the back of the hand facing the direction of the stroke

backhand (adjective)	left-slanting (adjective)
(of racket strokes) made across the body with back of hand facing direction of stroke	(of handwriting) having the letters slanting backward
(of handwriting) having the letters slanting backward

backhand (verb)	left-slanting (verb)
hit a tennis ball backhand