different between ingratiating vs bootlicking

English

ingratiating (comparative more ingratiating, superlative most ingratiating)

Which ingratiates; which attempts to bring oneself into the favour of another, often with flattery or insincerity.
That was an ingratiating smile.

ingratiating

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."

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