1. When an English noun is followed by the suffix "-er," it often indicates someone who engages in a particular activity or possesses a certain characteristic. For instance, "worker" refers to a laborer, and "teacher" refers to an educator.
2. It's not the case that adding the suffix "-er" to any word will automatically transform it into a noun. This conversion is specific to certain words and requires cumulative learning and understanding.
3. The suffix "-er" is also used to form the comparative degree of adjectives. For example, "fast" becomes "faster" to indicate greater speed.
