You can use the word host in a sentence like this:
"The host asked the contestants if they knew where Bangkok was."
My preconception of the book "The Host" is boring.
The host asked the contestants if they knew where the bath room was
The reverend will consecrate the host during the church service.
This party is amazing, who is the host?
The host had an open bar at the AA party. That party was a fiasco.
The host's speaking style is too stilted to appeal to a general audience.
The UK will host the Olympic Games in 2012.
You should always thank your host when you leave a party.
The host is the organism for which a parasite lives off of.
He consecrated the host for communion.
My host was both gracious and hospitable.
Can you use the word concluding in a sentence? Done.