helper

As a noun helper

is one who helps; an aide.

As a proper noun hel is

(norse mythology) the goddess of the dead, a daughter of loki.

Lackey is a synonym of helper.

As nouns the difference between lackey and helper

is that lackey is a footman, a liveried male servant while helper is one who helps; an aide.

As a verb lackey

is to attend, wait upon, serve obsequiously.

As nouns the difference between helper and participant

is that helper is one who helps; an aide while participant is one who participates.

As an adjective participant is

sharing; participating; having a share of part.

As nouns the difference between mason and helper

is that mason is a freemason while helper is one who helps; an aide.

As a proper noun mason

is for a stonemason.

As nouns the difference between helper and understudy

is that helper is one who helps; an aide while understudy is a performer who understudies; a standby.

As a verb understudy is

to study or know a role to such an extent as to be able to replace the normal performer when required.

Backer is a related term of helper.

As nouns the difference between backer and helper

is that backer is baker while helper is one who helps; an aide.

Acolyte is a synonym of helper.

As nouns the difference between acolyte and helper

is that acolyte is (ecclesiastical) one who has received the highest of the four minor orders in the catholic church, being ordained to carry the wine, water and lights at mass while helper is one who helps; an aide.

As nouns the difference between helper and friend

is that helper is one who helps; an aide while friend is a person other than a family member, spouse or lover whose company one enjoys and towards whom one feels affection.

As a verb friend is

to act as a friend to, to befriend; to be friendly to, to help.

As a proper noun Friend is

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As nouns the difference between helper and volunteer

is that helper is one who helps; an aide while volunteer is one who enters into, or offers for, any service of his/her own free will, especially when done without pay.

As a verb volunteer is

to enlist oneself as a volunteer.