react (v.)

• acknowledge
• act
• answer
• behave
• dig
• echo
• function
• operate
• perform
• proceed
• reciprocate
• recur
• reecho
• rejoin
• renovate
• reply
• respond
• retaliate
• retort
• return
• reverberate
• revert
• riposte
• say
• share
• take
• turn
• work