plant vs crop

plant and crop both are nouns.

As nouns, crop is a hyponym of plant; that is, crop is a word with a more specific, narrower meaning than plant:

Other hyponyms of plant include microflora, endemic, holophyte, non-flowering plant, plantlet, wilding, ornamental, pot plant, acrogen, apomict, aquatic, cryptogam, annual, biennial, perennial, escape, hygrophyte, neophyte, embryo, monocarp, monocarpic plant, monocarpous plant, sporophyte, gametophyte, houseplant, garden plant, vascular plant, tracheophyte, poisonous plant, epiphyte, epiphytic plant, aerophyte, air plant, rock plant, autophyte, autophytic plant, autotroph, autotrophic organism, myrmecophyte, phytoplankton.

plant (noun)	crop (noun)
buildings for carrying on industrial labor	the yield from plants in a single growing season
(botany) a living organism lacking the power of locomotion	a cultivated plant that is grown commercially on a large scale
an actor situated in the audience whose acting is rehearsed but seems spontaneous to the audience	a collection of people or things appearing together
something planted secretly for discovery by another	the output of something in a season
	the stock or handle of a whip
	a pouch in many birds and some lower animals that resembles a stomach for storage and preliminary maceration of food

plant (verb)	crop (verb)
put or set (seeds, seedlings, or plants) into the ground	cut short
fix or set securely or deeply	prepare for crops
set up or lay the groundwork for	yield crops
place into a river	let feed in a field or pasture or meadow
place something or someone in a certain position in order to secretly observe or deceive	feed as in a meadow or pasture
put firmly in the mind	cultivate, tend, and cut back the growth of