"clutter" in the noun sense
1. clutter, jumble, muddle, fuddle, mare's nest, welter, smother
a confused multitude of things
2. clutter
unwanted echoes that interfere with the observation of signals on a radar screen
"clutter" in the verb sense
1. clutter, clutter up
fill a space in a disorderly way
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License