bhuja 'an arm' and nyubja 'a kind of bodily disease' are irregularly formed without any change of their j before ghañ,
The word भुजः = भुज्यतेऽनेन, with घञ् 3.3.121. The irregularity consists in the absence of Guna, as well as of gutturalisation. न्युव्जिताः शरतेऽस्मिन् = न्युव्जः from the root उव्ज अर्जवे (Tudadi 20). The irregularity consists in the non-changing of ज ॥ When not meaning 'an arm' and 'a disease', we have भोगः, समुद्गः ॥,