Lagoon
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Acoustical energy is only the vibrations that make sound, so sound is another name.
silence
Another name that can be used to refer to sound energy is vibration energy
Mach.
Scow, flat, barge, raft... you'd need to be more specific.
Sound wave
Another name for a sound card is an audio card. It is a hardware component that enables a computer to process and output sound, allowing for audio playback and recording. Sound cards can be integrated into the motherboard or installed as separate expansion cards.
arithmetic
Another name for shallow water is "littoral zone." This term often refers to the area near the shore of a body of water, where sunlight penetrates, allowing for plant growth and a diverse ecosystem. Shallow waters can also be described as "intertidal zones" in coastal areas, where the water level fluctuates with tides.
A saddle roof is another name for a saddleback, a saddle shaped ridge forming a shallow pass between two peaks.