What do you call words made from common English words?

They’re called compound words.

According to Wikipedia:

Compounding occurs when two or more words or signs are joined to make one longer word or sign. The meaning of the compound may be similar to or different from the meaning of its components in isolation.

From Cambridge Dictionary:

Many compound nouns are written as one word, but some are written with hyphens or spaces. In modern English, hyphens are less common than they were in the past.

Examples of one word:

• bathroom sheepdog windscreen

Examples of hyphens:

• check-in fire-fighter son-in-law

Examples of spaces:

• bottle opener New Year’s Day Prime Minister