homoiousians

ˌhɒmɔɪˈuːsɪən
ˌhɒmɔɪˈaʊsɪən
ˌhɒmɔɪˈuːzɪən
ˌhɒmɔɪˈaʊzɪən

noun

a person who held that God the Father and God the Son are of like but not identical substance.