seesaw (n.)
- alternate
- alternation
- cant
- carousel
- coaction
- concurrence
- cooperation
- engagement
- flounder
- incline
- interaction
- interchange
- intercommunication
- intercourse
- interplay
- lean
- list
- lurch
- merry-go-round
- mesh
- meshing
- metronome
- oscillator
- pendulum
- pitch
- reciprocal
- reciprocation
- rock
- rocker
- roll
- roundabout
- shift
- shuffle
- shuttle
- shuttlecock
- stagger
- swag
- sway
- swing
- teeter
- teeter-totter
- teeterboard
- tilt
- tilter
- totter
- turn
- vary
- vibrator
- waver
- whip
- whirligig
- wobble
- yaw
- zigzag
