Every word in the list is thematically related to pirate in some way, and each word rhymes with the other words on the same line.
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Figuring out which words are related is more of an art than a science. You can help RhymeCrime improve by pressing thumbs-up on words that are definitely related to the word you entered, and pressing thumbs-down on words that are definitely not related to the word you entered.
What's that second optional box for?
I'm glad you asked! The second box finds rhyming pairs where the first rhyme is related to the first word you entered, and the second rhyme is related to the second word you entered. For example, if you enter "food" in the first box and "evil" in the second box, RhymeCrime will give you rhymes like
Each pair of words rhymes, each word on the left side is thematically related to food in some way, and each word on the right side is thematically related to evil.