What part of speech is bitter?

"Bitter" can be several parts of speech depending on how it's used in a sentence:

* Adjective: Describing a taste or feeling. Example: "The coffee was bitter."

* Noun: Referring to the taste or feeling itself. Example: "The bitterness of defeat was hard to swallow."

* Verb: Meaning to make something taste bitter. Example: "The chemicals bitter the water."

So, the part of speech depends on the context!