The common answers for the crossword clue "kind of wave" include:
- SINE (4 letters)
- TIDAL (5 letters)
- HEAT (4 letters)
- ALPHA (5 letters)
- SEISMIC (7 letters)
- SONIC (5 letters)
- RADIO (5 letters)
The most frequent and likely answer for a 4-letter solution is "SINE," referring to a sine wave, a fundamental kind of wave in physics and mathematics.
