"caulks" in the noun sense
1. caulk, caulking
a waterproof filler and sealant that is used in building and repair to make watertight
"caulks" in the verb sense
1. caulk, calk
seal with caulking
"caulk the window"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License