The word "bitingness" refers to something that has a sharp, pungent or acidic taste. Synonyms for this word might include words like acidity, tartness, bitterness or acridity. Other possible synonyms might include words like sourness, sharpness or tanginess, all of which describe the same taste sensation. In addition, words like spiciness or heat could also be used if the bitingness is due to the presence of hot peppers or other spices. Ultimately, the choice of synonym will depend on the context in which the word is used and the specific qualities of the flavor being described.