Both yeast and fungus have something to do with fungi. The fungus is a part of the fungi kingdom, while yeast is a unicellular fungus. The fungus is made up of the branches of long tubes that cover several areas, while yeast is somehow related to mushroom. Yeast happens to be one of the over 80 thousand of the species in the fungus kingdom. The fungus is of various features, which include a lack of chlorophyll and vascular tissues.
The reproductive means of yeast is through budding, while fungi reproduce through both sexual and asexual means of production. Some of the fungi's means of reproduction are through spores, and others produce clones of themselves. Archaeologists revealed the discovery of yeast in Egypt, in bakeries and breweries as far as 4000 years back. People started to be conscious of yeast in the 19th century. Louis Pasteur became the first person to reveal that yeast is a living organism.