The correct noun for the ?doer? of a verb.

Question

In English we usually construct the noun for a person who carries out the action described by a verb by taking the infinitive of the verb, less the 'to? and any final e and then adding -er usually but occasionally 'or or -ar, for example
A person who sings ? to sing ? singER
A person who demonstrates ? to demonstrate ? demonstratOR
A person who burgles ? to burgle ? burglAR
I noticed that in Spanish, the suffix 'dor(a) crops up a lot in this context,for example, limpiador(a), encargador(a) and ganador(a). Is it possible to assume that the correct Spanish noun for the 'doer? of any verb is the infinitive of that verb minus the final r plus the 'dor(a) suffix unless the dictionary says otherwise'

Answer 1

Thanks very much to both of you for your answers

Answer 2

The correct name is "agente":

El sufijo -(d)or / -(s)or / -(t)or indica el agente. (the suffix -dor indicates the agent)

Other similar suffixes (not so common): -(a)nte (comerciante), -ero (portero), -dero (curandero), -sor (defensor), -ario (bibliotecario), -ista (taxista), -ano (cirujano)

Notice that this is also true in English.

Answer 3

El sufijo 'dor (masc.)/dora (fem.)? significa/The suffix 'Dor,dora? mean:

1.- Máquina o instrumento (machine, appliance)
Abrir (to open)/Abridor (opener)
Aspirar (to breathe in, aspirate)/Aspidor,aspiradora (vacuum cleaner)
Calcular (to calculate)/Calculadora (calculator)
Congelar (to freeze,congelate)/Congelador (freezer)
Despertar (to awaken,rouse,wake up)/Despertador (alarm clock)
Incinerar (to incinerate,cremate)/Incinerador (incinerator)
Lavar (to wash)/Lavadora (wash machina)
Radiar (to radiate)/Radiador (radiator)
Tostar (to toast)/Tostador (toaster)

2.- Profesión o persona que realiza una acción (one who, denotes profession)
Cazar (to hunt)/Cazador (hunter)
Diseñar (to design)/Diseñador (designer)
Jugar (to play)/Jugador (player)
Observar (to observe)/Observador (observer)
Tirar (to shoot, throw, cast)/Tirador (shooter)

También se usa el sufijo 'Ante? en algunas palabras/Sometimes is used the suffix Ante (mean one who, denotes profession)
Amar (to love)/Amante (lover)
Atacar (to attack)/Atacante (attacker)
Cantar (to sing)/Cantante (singer)
Caminar (to walk)/Caminante (walker)
Danzar (to dance)/Danzante (dancer)
Emigrar (to emigrate)/Emigrante (Emigrant)
Estudiar (to study)/Estudiante (student)
Vigilar (to match)/Vigilante (guard)
Votar (to vote)/Votante (Voter)