beat vs be

beat is a noun but be is not a noun.

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

As verbs, be is a hypernym of beat; that is, be is a word with a broader meaning than beat:

beat: be superior
be: have the quality of being; (copula, used with an adjective or a predicate noun)

beat (noun)	be (noun)
the act of beating to windward; sailing as close as possible to the direction from which the wind is blowing
a stroke or blow
a regular rate of repetition
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)	be (adjective)
very tired

beat (verb)	be (verb)
wear out completely	spend or use time
be a mystery or bewildering to	work in a specific place, with a specific subject, or in a specific function
come out better in a competition, race, or conflict	have an existence, be extant
beat through cleverness and wit	have life, be alive
hit repeatedly	form or compose
give a beating to; subject to a beating, either as a punishment or as an act of aggression	have the quality of being; (copula, used with an adjective or a predicate noun)
stir vigorously	occupy a certain position or area; be somewhere
strike (a part of one's own body) repeatedly, as in great emotion or in accompaniment to music	be identical to; be someone or something
strike (water or bushes) repeatedly to rouse animals for hunting	be identical or equivalent to
shape by beating	represent, as of a character on stage
make by pounding or trampling	be priced at
produce a rhythm by striking repeatedly	to remain unmolested, undisturbed, or uninterrupted -- used only in infinitive form
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