HARC is a relatively uncommon word, and there are several synonyms that can be used in its place. For example, you could use the word harass, which means to persistently bother or intimidate someone. Another option is to use the word hound, which means to pursue or pester relentlessly. Another synonym for HARC is nag, which means to criticize or complain constantly. You could also use badger as a synonym for HARC, which means to pester or annoy persistently. Ultimately, the synonym used will depend on the specific context in which the word is being used, but these options provide some versatile alternatives.