beat vs lash

beat and lash both are nouns.

Word	Noun	Adjective	Verb	Adverb
beat	Yes	Yes	Yes	No
lash	Yes	No	Yes	No

As verbs, lash is a hyponym of beat; that is, lash is a word with a more specific, narrower meaning than beat:

beat: give a beating to; subject to a beating, either as a punishment or as an act of aggression
lash: beat severely with a whip or rod

beat (noun)	lash (noun)
the act of beating to windward; sailing as close as possible to the direction from which the wind is blowing	a quick blow delivered with a whip or whiplike object
a stroke or blow	leather strip that forms the flexible part of a whip
a regular rate of repetition	any of the short curved hairs that grow from the edges of the eyelids
the basic rhythmic unit in a piece of music
(prosody) the accent in a metrical foot of verse
the rhythmic contraction and expansion of the arteries with each beat of the heart
the sound of stroke or blow
a regular route for a sentry or policeman
a member of the beat generation; a nonconformist in dress and behavior
a single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations

beat (adjective)	lash (adjective)
very tired

beat (verb)	lash (verb)
wear out completely	strike as if by whipping
be a mystery or bewildering to	beat severely with a whip or rod
come out better in a competition, race, or conflict	bind with a rope, chain, or cord
beat through cleverness and wit	lash or flick about sharply
hit repeatedly
give a beating to; subject to a beating, either as a punishment or as an act of aggression
stir vigorously
strike (a part of one's own body) repeatedly, as in great emotion or in accompaniment to music
strike (water or bushes) repeatedly to rouse animals for hunting
shape by beating
make by pounding or trampling
produce a rhythm by striking repeatedly
move rhythmically
sail with much tacking or with difficulty
move with a flapping motion
indicate by beating, as with the fingers or drumsticks
move with a thrashing motion
move with or as if with a regular alternating motion
make a rhythmic sound
make a sound like a clock or a timer
glare or strike with great intensity
avoid paying
be superior