List of Spanish irregular participles

In the Spanish language there are some verbs with irregular participles. There are also verbs with both regular and irregular participles, in which the irregular form is most used as an adjective, while the regular form tends to appear after "haber" to form compound perfect tenses.
Agreement.
When a participle is used as adjective, it must agree in gender and number with the noun modified:
Verbs with irregular participles.
1The roots "-scribir", "-facer", and "-solver" appear only in prefixed forms, e.g. "inscribir", "satisfacer", "absolver". The adjective "suelto" means 'loose, free'.
2The variant "-scripto" is user in Argentina, Paraguay, and Uruguay.
Verbs derived from the stems in the table above have participles similar to those of their "parent" verbs — e.g. "devolver" → "devuelto," "componer" → "compuesto". Note, however, that this pattern is not followed by "corromper", whose participle is regular ("corrompido"), nor by "bendecir" and "maldecir" (see table below).
Verbs with regular and irregular participles.
A number of former irregular participles, such as "confuso" ('confused', from "confundir"), "poseso" ('possessed', from "poseer"), and "suspenso" ('suspended, hung', from "suspender"), are nowadays used solely as adjectives, not as participles, and are therefore no longer considered as such.