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Open English Wordnet Nouns (n) hollow a cavity or space in something “hunger had caused the hollows in their cheeks”
(n) hollow , holler a small valley between mountains “he built himself a cabin in a hollow high up in the Appalachians”
(n) hole , hollow a depression hollowed out of solid matter
Verbs (v) excavate , dig , hollow remove the inner part or the core of “the mining company wants to excavate the hillside”
Adjectives (a) hollow not solid; having a space or gap or cavity “a hollow wall” ,
“a hollow tree” ,
“hollow cheeks” ,
“his face became gaunter and more hollow with each year”
(s) hollow as if echoing in a hollow space “the hollow sound of footsteps in the empty ballroom”
(s) empty , hollow , vacuous devoid of significance or force “empty promises” ,
“a hollow victory” ,
“vacuous comments”
(s) hollow lacking in substance or character “a hollow person”