sycophant

As verbs the difference between sycophant and sycophantize

is that sycophant is to inform against; hence, to calumniate while sycophantize is to play the sycophant.

As a noun sycophant

is one who uses obsequious compliments to gain self-serving favor or advantage from another; a servile flatterer.

As nouns the difference between sycophant and psychophant

is that sycophant is one who uses obsequious compliments to gain self-serving favor or advantage from another; a servile flatterer while psychophant is a sycophant, especially one with psychological problems.

As a verb sycophant

is to inform against; hence, to calumniate.

In transitive terms the difference between sycophant and bootlick

is that sycophant is to play the sycophant toward; to flatter obsequiously while bootlick is to seek favor from by fawning, servile behavior.