A partner is a friend, a mate and a confidant.
A partner is a supporter, a sponsor, an advocate, a patron, a backer, a partisan, a benefactor, an adherent and a well wisher.

Partnership means each of two or more people involved in a project or partnership; the state of being a partner. It means participation, a joint interest and an involvement (partaker).

A partner is a friend; one who supports a cause.
A partner is a supporter; one who helps and encourages.
A partner is a sponsor; one who helps in various ways.
A partner is an advocate; one who publicly recommends a cause.
A partner is a patron; one who gives financial support.
A partner is a partisan; one who is a committed sponsor
A partner is a benefactor; one who gives money or help
A partner is an adherent; one who is a firm supporter, a follower, a committed, loyal and a devoted person to the cause.

Luke 8:1-3 (NASB)
Soon afterwards, He (Jesus) began going around from one city and village to another, proclaiming and preaching the kingdom of God. The twelve were with Him.
And also some women who had been healed of evil spirits and sickness: Mary who was called Magdalene, from whom seven demons had gone out,
And Joanna the wife of Chuza, Herod’s steward, and Susanna, and many others who were contributing to their support (the support of Jesus’ s ministry) out of their private means.

Luke 15:3-7 (NIV)
Then Jesus told them this parable:
“Suppose one of you has a hundred sheep and loses one of them. Does he not leave the ninety-nine in the open country and go after the lost sheep until he finds it? And when he finds it, he joyfully puts it on his shoulders and goes home. Then he calls his friends (friendship) and neighbours together and says, ‘Rejoice with me; I have found my lost sheep.’ I tell you that in the same way there will be more rejoicing in heaven over one sinner who repents than over ninety-nine righteous persons who do not need to repent.