chord vs seventh chord

chord and seventh chord both are nouns.

Word	Noun	Adjective	Verb	Adverb
chord	Yes	No	Yes	No
seventh chord	Yes	No	No	No

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

chord: a combination of three or more notes that blend harmoniously when sounded together
seventh chord: a triad with a seventh added

Other hyponyms of chord include arpeggio, sforzando, common chord, triad.

chord (noun)	seventh chord (noun)
a combination of three or more notes that blend harmoniously when sounded together	a triad with a seventh added
a straight line connecting two points on a curve

chord (verb)	seventh chord (verb)
bring into consonance, harmony, or accord while making music or singing
play chords on (a stringed instrument)