Words that end in "-s" but are singular:
* news
* series
* species
* means
* politics
* physics
* athletics
* economics
* ethics
* mathematics
* linguistics
* genetics
* statistics
* optics
* acoustics
* electronics
* mumps
* measles
* diabetes
* billiards
* bowls
* darts
* quarters
* barracks
* quarters
* headquarters
Other words that look plural but are singular:
* sheep
* deer
* fish (sometimes)
* series
* aircraft
Words that can be singular or plural:
* fish (can be singular or plural)
* series (can be singular or plural)
* sheep (can be singular or plural)
* deer (can be singular or plural)
It's important to note:
* The context will often tell you whether these words are being used as singular or plural.
* Some of these words, like "series" and "fish," can be used in both singular and plural contexts.
Let me know if you'd like any more examples or have any questions!