Blah and Flats

Blah noun - Language, behavior, or ideas that are absurd and contrary to good sense.

Flats and blah are semantically related In some cases you can replace term "Flats" with "Blah", this nouns are similar.

Flats noun - Footwear (shoes or slippers) with no heel (or a very low heel).

Blah and flats are semantically related in dull topic. Sometimes you can use "Blah" instead an adjective "Flats".