Aggregation, for short, 3 letters
Aggregation: Abbr., 3 letters
Assn. or org., 3 letters
Assoc., 3 letters
Cluster: Abbr., 3 letters
One might get a pref. rate, 3 letters
Org., 3 letters
Org. or assoc., 3 letters
Type of rate, for short, 3 letters
Assns., 4 letters
Assns. and orgs., 4 letters