The word "teemer" is not a very common one in the English language. Some synonyms for "teemer" could include words like "abound", "overflow", "teem with", "swarm with", "bursting with" and "filled with". These words all suggest that something is in great abundance or is overflowing with something else. For example, a garden might "teem with" flowers, a city may be "bursting with" people, or a river might "overflow" with water. By using synonyms, a writer can effectively convey the same idea using different words and phrases, adding nuance and variety to their writing.