The difference between Ass-kisser and Sycophant
When used as nouns, ass-kisser means someone who kisses ass (who acts obsequiously in order to gain another's favor), whereas sycophant means one who uses obsequious compliments to gain self-serving favor or advantage from another.
Sycophant is also verb with the meaning: to inform against.
check bellow for the other definitions of Ass-kisser and Sycophant
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Ass-kisser as a noun (North America, vulgar, slang):
Someone who kisses ass (who acts obsequiously in order to gain another's favor).
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Sycophant as a noun:
One who uses obsequious compliments to gain self-serving favor or advantage from another; a servile flatterer.
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Sycophant as a noun:
One who seeks to gain through the powerful and influential.
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Sycophant as a noun (obsolete):
An informer; a talebearer.
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Sycophant as a verb (transitive):
To inform against; hence, to calumniate.
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Sycophant as a verb (transitive):
To play the sycophant toward; to flatter obsequiously.