We don't have synonyms for ithamar yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are thamar and itamar.
(N) :
In the Torah, Ithamar was the fourth (and the youngest) son of Aaron the High Priest.
(N) :
(sometimes YthamarFarmer Oxford Dictionary of Saints p. 266) the first bishop in England to be Saxon-born rather than consecrated by the Irish or from among Augustine's Roman missionaries.
(N) :
In the Torah, Ithamar was the fourth (and the youngest) son of Aaron the High Priest.
(N) :
(sometimes YthamarFarmer Oxford Dictionary of Saints p. 266) the first bishop in England to be Saxon-born rather than consecrated by the Irish or from among Augustine's Roman missionaries.