mass noun
noun
: a noun that denotes a homogeneous substance or a concept without subdivisions and that in English is preceded in indefinite singular constructions by some rather than a or an
"sand" and "water" are mass nouns
compare count noun 
Word History
First Known Use
1933, in the meaning defined above
- proteases
- protect
- protect one's ass
- protectable
- protectant
- protectants
- protected
- protected state
- protectedly
- protecting
- protection
- protection and indemnity insurance
- protection forest
- Protection line
- protectional
- protectionism
- protectionisms
- protectionist
- protectionists
- protections
- protective
- protective coating
- protective coloration
- ozothamnuses
- ozothamnusses