....is tough for me.

I've got BLUE.

I've got two other "Connections" that are likely GREEN and YELLOW but 5 words that could fit in either one:

PUNCTURE; LEAK; HOLE; NICK; CRACK

PHRASE; SENTENCE; PASSAGE; WORD; LETTER

I can't think of what PURPLE would be (I have SANDS and WASTE likely in that group) so I can't determine which of those words above I can move out and into PURPLE.

Stumped.