Air-crafts make a sonic boom known as a "boom'sound or 'whip cracking' (cracking) sound.
Milquetoast is a word used to describe someone who is extremely passive.
Alleles?
genotype
The word describe is classified as a noun, a verb, a participle, and an interjection. Because the word describe is basically used to describe other words, it falls into many different categories depending on the variation of the sentence.
Imperial.Customary is another word.
Echo
Pitch
Yes! "Achoo" is an onomatopoeia because it is used to describe the sound it resembles (in this case, "achoo" is the word used to describe the sound of someone sneezing).
harmonized (adjective)
Generally the word microscopic cannot be used to describe a sound. The word microscopic is often a dictation of visual size - i.e requiring a microscope to view, or invisible to the naked eye.
Cacophony is the proper spelling. It is the word used to describe a harsh discordance of sound.
Ker-plunk is a word used to describe a sound like splash.
Onomatopoetic. It means that the word used to describe something has a sound reminiscent of the thing itself. For example, the Chinese word for "cat" is "miao," which is the sound a cat makes.
Improper is a word that is usually used to describe a word that has been incorrectly used.
Meow is the word that is generally used to describe the sound that cats make. The word meow is an example of onomatopoeia, a word that sounds just like what it means.
It's not a word, it's a noise, captured in letters. Often used to describe the sound of someone clearing their throat.
Ripple