What's the difference between garum and grum?

Garum

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Definition:

• (n.) A sauce made of small fish. It was prized by the ancients.

Example Sentences:

Grum

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Definition:

• (a.) Morose; severe of countenance; sour; surly; glum; grim.
• (a.) Low; deep in the throat; guttural; rumbling; as,

Example Sentences:

• (1) She has projects lined up with many of the new exponents of disco, including Goldroom , Grum and Mighty Mouse .