pitch vs slope

pitch and slope both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitch	Yes	No	Yes	No
slope	Yes	No	Yes	No

As nouns, slope is a hypernym of pitch; that is, slope is a word with a broader meaning than pitch:

pitch: degree of deviation from a horizontal plane
slope: the property possessed by a line or surface that departs from the horizontal

Other hypernyms of pitch include gradient.

As verbs, pitch and slope are synonyms defined as:

Other synonyms of pitch include incline.

pitch (noun)	slope (noun)
the action or manner of throwing something	the property possessed by a line or surface that departs from the horizontal
an all-fours game in which the first card led is a trump	an elevated geological formation
a high approach shot in golf
the act of throwing a baseball or softball by the pitcher towards home plate, which initiates play by giving the batter a chance to hit it
abrupt up-and-down motion (as caused by a ship or other conveyance)
the property of sound that varies with variation in the frequency of vibration
degree of deviation from a horizontal plane
promotion by means of an argument and demonstration
a vendor's position (especially on the sidewalk)
a sports field with predetermined dimensions for playing soccer
any of various dark heavy viscid substances obtained as a residue

pitch (verb)	slope (verb)
set to a certain pitch	be at an angle
set the level or character of
lead (a card) and establish the trump suit
throw or toss with a light motion
erect and fasten
hit (a golf ball) in a high arc with a backspin
throw or hurl from the mound to the batter, as in baseball
fall or plunge forward
be at an angle
heel over
move abruptly
sell or offer for sale from place to place