As detailed above, 'rascal' can be a noun or an adjective. Noun usage: If you have deer in the area, you may have to put a fence around your garden to keep the rascals out.

What is this word rascal?

1 : a mean, unprincipled, or dishonest person. 2 : a mischievous person or animal.

What part of speech is rascal?

RASCAL (noun) definition and synonyms | Macmillan Dictionary.