beat vs fatigue

beat and fatigue both are nouns.

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

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

Other hypernyms of beat include fag, fag out, jade, outwear, tire, tire out, wear, wear down, wear out, wear upon, weary.

beat (noun)	fatigue (noun)
the act of beating to windward; sailing as close as possible to the direction from which the wind is blowing	labor of a nonmilitary kind done by soldiers (cleaning or digging or draining or so on)
a stroke or blow	(always used with a modifier) boredom resulting from overexposure to something
a regular rate of repetition	temporary loss of strength and energy resulting from hard physical or mental work
the basic rhythmic unit in a piece of music	used of materials (especially metals) in a weakened state caused by long stress
(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)	fatigue (adjective)
very tired

beat (verb)	fatigue (verb)
wear out completely	exhaust or get tired through overuse or great strain or stress
be a mystery or bewildering to	lose interest or become bored with something or somebody
come out better in a competition, race, or conflict
beat through cleverness and wit
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