Guttural is a word used to refer to five Hebrew letters. video or p12 in this pdf.
א ה ח ע ר
Gutturals will never accept a dagesh, and they do not like vocal shevas.
- In light of the former, study compensatory lengthening.
- In light of the latter, know that a sheva under a guttural will become a composite sheva.
- The gutturals affect the conjugation of verbs by “weakening” the root of the word. cf. weak verb.
- gutturals prefer A class vowels.