Question

select the comparative and superlative forms in this dictionary entry.
common \kom-uhn\\ adjective commoner, commonest 1. joint or united: we share a common interest in paragliding. 2. frequently occurring; not rare: michael is a common name for boys in the united states. 3. widespread or general: antilock brakes are a common feature on new cars. — from latin (communis)

Explanation:

In the dictionary entry for "common", the comparative form (used to compare two things) is listed as "commoner", and the superlative form (used to compare three or more things) is listed as "commonest".

Answer:

Comparative form: commoner; Superlative form: commonest