different between bootlicking vs kowtowing

English

bootlicking

bootlicking (countable and uncountable, plural bootlickings)

servile behaviour
- 1951, The Library Assistant (volumes 44-45, page xiii)
  The most obvious — for a junior struggling to lift himself from the mire by his bootlickings — is to go to his Chief and say — frankly — "Out! I need the experience and you need a rest. Clear off for a month or two. I'll cope."

kowtowing

kowtowing (plural kowtowings)

The act of one who kowtows; a submissive bow.
- 1910, Robert Ames Bennet, The Shogun's Daughter
  Yoritomo met their smiles and kowtowings and noisy insuckings of breath with an austere dignity that I took pains to imitate.

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