主

also 重

1. na-adjective, noun chief; main; principal; important
2. abbreviation, usu. written as オモ main secondary or supporting role (in kyogen)

しゅ

1. noun (one's) master; (one's) employer; (one's) lord
2. leader (of a country, group, etc.); head; chief
3. Christianity Lord
4. main thing; chief part; first consideration; primary object; principal aim

ぬし

1. noun head (of a household, etc.); leader; master
2. owner; proprietor; proprietress
3. subject (of a rumour, etc.); doer (of a deed)
4. guardian spirit (e.g. long-resident beast, usu. with mystical powers); long-time resident (or employee, etc.)
5. husband
6. pronoun, familiar you

あるじ also 主人

1. noun head (of a household); proprietor (of a store); proprietress; landlord; landlady; master (of a servant)
2. archaic entertaining someone as one's guest

にし · のし

1. pronoun, archaic, familiar you

す also 子

1. suffix, archaic, honorific honorific (or familiar) suffix used after a name

しゅう

1. noun (one's) master; (one's) employer; (one's) lord