different between bunching vs tuberosity

English

bunching

bunching (countable and uncountable, plural bunchings)

(countable) An arrangement of items in a bunch.
- 1974, Isabella Bird, Six Months in the Sandwich Islands, amongst the Palm Groves, Coral Reefs and Volcanoes
  The foreign ladies, in their simple, tasteful, fresh attire, innocent of the humpings and bunchings, the monstrosities and deformities of ultra-fashionable bad taste, beamed with cheerfulness, friendliness, and kindliness.
(uncountable) The illegitimate supplying of laboratory animals that are actually kidnapped pets or illegally trapped strays.

tuber +? -osity

tuberosity (countable and uncountable, plural tuberosities)

(uncountable) The condition of being tuberous
(countable, anatomy) A rounded protuberance, at the end of a bone, to which a muscle or tendon is attached

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