Englishfor English speakers
topic
Noun
—
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.
of
Preposition
—
Made using.
It is a house of cards.
conversation
Noun
—
A conversation is when two or more people are talking informally.
I had a really interesting conversation at work about how to improve things.
She is very good at making conversation with people she meets.