A deaconess is not a deacon. She had a role in the ministry, but she was not an ordained cleric. A deaconess did not receive the sacrament of Holy Orders and wouldn’t rise to the presbyterate or episcopate.
Clement of Alexandria provides some insight on this point when he addresses the context of 1 Corinthians 9:5 (remember that the koine greek word for wife and woman are the same, and 1 Cor 9:5 offers clarification by prefacing the word for wife/woman with the word sister):
Accordingly he says in a letter: “Have we not a right to take about with us a wife [woman] that is a sister like the other apostles?” But the latter, in accordance with their particular ministry, devoted themselves to preaching without any distraction, and took their wives [women] with them not as women with whom they had marriage relations, but as sisters, that they might be their fellow-ministers in dealing with housewives. It was through them that the Lord’s teaching penetrated also the women’s quarters without any scandal being aroused.
According to Clement, these women, who would be deaconesses, had a role in bringing the gospel to other women, because they could go to places that men couldn’t without causing scandal or offense. 1 Timothy 3:11 may refer to women who were selected for this role.
In some sense, the role is a bit of a discipline, like lay EMHCs, Lectors, and altar servers (I am not saying deaconesses served at the altar, just an example). It’s not a sacramental or doctrinal order.