Oligosaccharide and Saccharide

Oligosaccharide noun - Any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis.

Saccharide and oligosaccharide are semantically related. In some cases you can use "Saccharide" instead a noun "Oligosaccharide".

Saccharide noun - An essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain.

Oligosaccharide and saccharide are semantically related. Sometimes you can replace term "Oligosaccharide" with "Saccharide", this nouns are similar.