Answer:
家 KA, KE, ie, ya - house, family
屋 OKU, ya - roof, dealer
河 KA, kawa - river
類 RUI - type, kind, genus
友 YUU, tomo - friend
All take 大 (DAI, oo(kii) - big) in front to make a word, but only 河 uses the "TAI" reading (TAIGA); the others are all "Oo-":
大家 OOYA - landlord
大屋 OOYA - landlord
大河 TAIGA - large river, epic tale
大類 OORUI - a family name
大友 OOTOMO - a family name, a great friend