Crabbe and Goyle guffawed sycophantically, but Malfoy had to stop there, because Hagrid emerged from the back of his cabin balancing a teetering tower of crates, each containing a very large Blast-Ended Skrewt.
There are no more uses of "sycophant" in the book.
Show samples from other sources
He was a sycophant to Stalin.
When complimenting a trait in someone, share at least one concrete example so they know it is not the empty flattery of a sycophant.