Identify parts of Speech for sentence below, on numbered word:

1 2 3
Before the eruption, Mount St.Helena was
4
like a giant pressure cooker.

From the way you have posted your question, we cannot tell which words are numbered.

Before (prep.) the (adj.) eruption (n.), Mount St. Helena (n.) was like (v.) a (adj.) giant (adj.) pressure (adj.) cooker (n.).