Agent Nouns:
* -er: Indicates someone who does something (baker, singer, writer).
* -or: Another common suffix for agent nouns (actor, conductor, inventor).
* -ist: Indicates someone who specializes in something (artist, scientist, pianist).
* -ian: Denotes someone belonging to a particular place or profession (musician, librarian, historian).
Other Nouns:
* -er: Can also indicate a tool or object (blender, steamer, shredder).
* -er: Sometimes used to create diminutives (cover, doorknob, sweater).
Adjectives:
* -er: Indicates comparison (stronger, taller, faster).
Verbs:
* -er: Forms the comparative form of adverbs (faster, quicker, louder).
It's important to note:
* Not all words ending in -er are formed with a suffix. Some words have this ending as part of their base form (water, sister, center).
* The specific meaning of a word ending in -er can vary depending on the context.