call option vs stock option

call option and stock option both are nouns.

Word	Noun	Adjective	Verb	Adverb
call option	Yes	No	No	No
stock option	Yes	No	No	No

As nouns, stock option is a hypernym of call option; that is, stock option is a word with a broader meaning than call option:

call option: an option to buy
stock option: the right to buy or sell a stock at a specified price within a stated period

call option (noun)	stock option (noun)
the option to buy a given stock (or stock index or commodity future) at a given price before a given date	the right to buy or sell a stock at a specified price within a stated period
an option to buy	a benefit given by a company to an employee in the form of an option to buy stock in the company at a discount or at a fixed price