Yeastlike is a descriptive term that is usually used to describe certain qualities of things that resemble yeast. If you are looking for synonyms for yeastlike, you might consider using words like yeasty, fermentative, or fungal. Other related words might include bubbly, effervescent, frothy, or fizzy, all of which suggest a certain liveliness or activity that is associated with yeast. Ultimately, the choice of word will depend on the context in which it is being used and the specific qualities being described. However, by choosing the right synonym, you can add greater clarity and precision to your writing, and help your readers better understand the nature of the thing being described.