layer vs crust

layer and crust both are nouns.

layer and crust both are verbs.

Word	Noun	Adjective	Verb	Adverb
layer	Yes	No	Yes	No
crust	Yes	No	Yes	No

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

layer: a relatively thin sheetlike expanse or region lying over or under another
crust: the outer layer of the Earth

Other hyponyms of layer include stratum, asthenosphere, chromosphere, Earth's crust, exosphere, hydrosphere, geosphere, lithosphere, lower mantle, mantle, mesosphere, ozone layer, ozonosphere, stratosphere, Earth's surface, surface, thermosphere, tropopause, troposphere, upper mantle, cell wall, snow.

layer (noun)	crust (noun)
thin structure composed of a single thickness of cells	the trait of being rude and impertinent; inclined to take liberties
a hen that lays eggs	the outer layer of the Earth
single thickness of usually some homogeneous substance	a hard outer layer that covers something
an abstract place usually conceived as having depth
a relatively thin sheetlike expanse or region lying over or under another

layer (verb)	crust (verb)
make or form a layer	form a crust or form into a crust

Difference between layer and crust

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