Englishfor English speakers
topic
Noun
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A topic is a general idea that someone is speaking (reading, thinking, etc.) about at a specific time.
We were talking about my problems. Don't change the topic.
Our library has books on a wide range of topics.
When you're writing for school, it's important to stay on topic, and not start talking about other things.
map
Noun
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A map is an image of a place, usually with place names written in.
I think we're lost. Do you have a map?
I've got a good street map of London.
map
Verb
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If you map something, you create a visual representation of it.
John mapped out his idea so that his friends could understand it.