We don't have synonyms for hard g yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hard r.
(n) :
(phonetics) The plosive /g/ sound in "get", "log" and "give" as distinct from the soft g in "gem", "giraffe", "lodge" and "generation".
(n) :
Alternative form of hard g. [(phonetics) The plosive /g/ sound in "get", "log" and "give" as distinct from the soft g in "gem", "giraffe", "lodge" and "generation".]
(n) :
(phonetics) The plosive /g/ sound in "get", "log" and "give" as distinct from the soft g in "gem", "giraffe", "lodge" and "generation".
(n) :
Alternative form of hard g. [(phonetics) The plosive /g/ sound in "get", "log" and "give" as distinct from the soft g in "gem", "giraffe", "lodge" and "generation".]