slam vs grand slam

slam and grand slam both are nouns.

Word	Noun	Adjective	Verb	Adverb
slam	Yes	No	Yes	No
grand slam	Yes	No	No	No

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

Other hyponyms of slam include little slam, small slam.

slam (noun)	grand slam (noun)
an aggressive remark directed at a person like a missile and intended to have a telling effect	winning all of the tricks in a hand of bridge
winning all or all but one of the tricks in bridge
a forceful impact that makes a loud noise
the noise made by the forceful impact of two objects