Where did Spanish and Portuguese get the word “comer” (“to eat”)? The Latin was “manducare,” and most other Romance languages use a descendant word (French “manger,” Italian “mangiare,” Romanian “a mânca,” Catalan “menjer,” etc).
comedere (to eat up entirely, consume, eat) is a well-attested verb in classical Latin — see. It was derived from com+edere. It survived in Iberian Romance.
The normal Latin verb for eating was edere (to eat:). This did not survive in Romance.
Edere had a number of synonyms in Latin: “comedo, vescor, pascor, devoro, haurio, mando, ceno, epulor”, and mando itself (to chew) had the synonym manduco. Manduco survived in Romance outside Iberia.