tremor vs temblor

tremor and temblor both are nouns.

Word	Noun	Adjective	Verb	Adverb
tremor	Yes	No	Yes	No
temblor	Yes	No	No	No

As nouns, temblor is a hypernym of tremor; that is, temblor is a word with a broader meaning than tremor:

tremor: a small earthquake
temblor: shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity

Other hypernyms of tremor include earthquake, quake, seism.

tremor (noun)	temblor (noun)
an involuntary vibration (as if from illness or fear)	shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity
a small earthquake
shaking or trembling (usually resulting from weakness or stress or disease)

tremor (verb)	temblor (verb)
shake with seismic vibrations