1) Acid 2) Acid class 3) Acid group 4) Acid head 5) Acid in proteins 6) Acid intro 7) Acid makes Naomi confused 8) Acid of dietary importance 9) Acid type 10) Acid variety 11) Acid with -NH2 12) Alkane 13) Alkane series 14) Aminic 15) An acid 16) Another type of acid 17) Certain acid 18) Certain acids Found on https://www.crosswordclues.com/clue/amino