Each group of three definitions describes three words that are spelled the same, except for one letter (each group describes a different set of words). Example: king, ring, wing.
1a) finished
1b) to sleep lightly
1c) a measured quantity
2a) covered
2b) mollusk
2c) applaud
3a) furtive
3b) to secretly observe
3c) an enclosure for pigs
4a) to direct
4b) costume
4c) duplicity
August 24th, 2011 | Category: 
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1. done
doze
dose
2. (dunno)
clam
clap
3. sly
spy
sty
that’s all I’ve got.
1a) finished DONE IS CORRECT
1b) to sleep lightly DOZE IS CORRECT
1c) a measured quantity DOSE IS CORRECT.
2a) covered UNANSWERED
2b) mollusk CLAM IS CORRECT
2c) applaud CLAP IS CORRECT
3a) furtive SLY IS CORRECT
3b) to secretly observe SPY IS CORRECT
3c) an enclosure for pigs STY IS CORRECT
4a) to direct STILL UNANSWERED
4b) costume STILL UNANSWERED
4c) duplicity STILL UNANSWERED
Good job so far, keep guessing.