pit vs nock

pit is a noun but nock is not a noun.

Word	Noun	Adjective	Verb	Adverb
pit	Yes	No	Yes	No
nock	No	No	Yes	No

pit (noun)	nock (noun)
a surface excavation for extracting stone or slate
a workplace consisting of a coal mine plus all the buildings and equipment connected with it
a trap in the form of a concealed hole
lowered area in front of a stage where an orchestra accompanies the performers
(auto racing) an area at the side of a racetrack where the race cars are serviced and refueled
(commodity exchange) the part of the floor of a commodity exchange where trading in a particular commodity is carried on
an enclosure in which animals are made to fight
(Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment
a sizeable hole (usually in the ground)
the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed
a concavity in a surface (especially an anatomical depression)

pit (verb)	nock (verb)
remove the pits from	make small marks into the surface of
set into opposition or rivalry
mark with a scar