senior vice president vs V.P.

senior vice president and V.P. both are nouns.

Word	Noun	Adjective	Verb	Adverb
senior vice president	Yes	No	No	No
V.P.	Yes	No	No	No

As nouns, V.P. is a hypernym of senior vice president; that is, V.P. is a word with a broader meaning than senior vice president:

senior vice president: the ranking vice president in a firm that has more than one
V.P.: an executive officer ranking immediately below a president; may serve in the president's place under certain circumstances

Other hypernyms of senior vice president include vice president.

senior vice president (noun)	V.P. (noun)
the ranking vice president in a firm that has more than one	an executive officer ranking immediately below a president; may serve in the president's place under certain circumstances