This is one of the core verbs of the language: לומר, to say. Around it cluster what is said (להיאמר), what is supposed to be the case (אמור, "as said / mentioned"), and the long-form act of saying, the article or statement (מאמר). The same letters even reach the ruler whose word is law, the emir (אמיר) and his emirate (אמירות), a borrowed cousin where to command is to speak. Every word here is verified against pealim, niqqud included.
The same root runs through the verb system. Each binyan is a voice: it bends the one idea into active, passive, causative or reciprocal. Tap to hear.
Pa'al gives the plain "to say"; nif'al is its passive partner, "to be said". A quirk worth knowing: in the infinitive, future and imperative, spoken Hebrew swaps in the synonym להגיד (from the root נ-ג-ד), so לומר and להגיד share the work of one verb. Pi'el, hif'il, pu'al, huf'al and hitpa'el are not lexicalized for this root.
Same root letters, different noun moulds (mishkalim). The mould tells you the function: who does it, the act of doing it, or the thing produced.
Strip the prefixes, suffixes and vowels. Three consonants remain, and the meaning lives there.