grind vs labour

grind and labour both are nouns.

Word	Noun	Adjective	Verb	Adverb
grind	Yes	No	Yes	No
labour	Yes	No	Yes	No

As nouns, labour is a hypernym of grind; that is, labour is a word with a broader meaning than grind:

Other hypernyms of grind include labor, toil.

As verbs, grind and labour are synonyms defined as:

Other synonyms of grind include dig, drudge, fag, labor, moil, toil, travail.

grind (noun)	labour (noun)
the act of grinding to a powder or dust	productive work (especially physical work done for wages)
hard monotonous routine work	any piece of work that is undertaken or attempted
the grade of particle fineness to which a substance is ground	a social class comprising those who do manual labor or work for wages
an insignificant student who is ridiculed as being affected or boringly studious	an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement
	concluding state of pregnancy; from the onset of contractions to the birth of a child

grind (verb)	labour (verb)
reduce to small pieces or particles by pounding or abrading	undergo the efforts of childbirth
make a grating or grinding sound by rubbing together	work hard
press or grind with a crushing noise	strive and make an effort to reach a goal
shape or form by grinding
created by grinding
dance by rotating the pelvis in an erotically suggestive way, often while in contact with one's partner such that the dancers' legs are interlaced
work hard