Senor vs Señor

Senor and Señor both are nouns.

Word	Noun	Adjective	Verb	Adverb
Senor	Yes	No	No	No
Señor	Yes	No	No	No

As nouns, Senor and Señor are synonyms defined as:

Senor and Señor: a Spanish title or form of address for a man; similar to the English `Mr' or `sir'

Senor (noun)	Señor (noun)
a Spanish title or form of address for a man; similar to the English `Mr' or `sir'	a Spanish title or form of address for a man; similar to the English `Mr' or `sir'