C3O1M3P3A1C3T1
15 points
COMPACT is validvalid
closely and firmly united [adj COMPACTER, COMPACTEST] : COMPACTLY [adv], COMPACTNESS [n] / to pack closely together [v COMPACTED, COMPACTING, COMPACTS]
to pack closely together [v -ED, -ING, -S] / closely fitted together [adj COMPACTER, COMPACTEST, COMPACTLY]