An apiary
A swarm
A colony
A person who studies honey bees is an apiologist. A person who keeps honey bees is an apiarist. A person that studies all types of bees is a melittologist.
Apiculture
Swarm
A person who raises bees and collects honey is a beekeeper or, more technically, an apiarist.
A hive
Don't kill them, if they are bees they are important pollinator animals and they make honey. I know the roof is not a place where they should be but rather than killing them call your local bee keeper and he will come and remove them alive for you.
Bees are actually very intelligent. They have great organizational, communication and navigational skills. Honey Bees in particular can attack without provocation and especially if they feel threatened. So be careful and call a professional immediately if you see a hive in your home or in your neighborhood.
If you mean the honey made by bees, the word is miel. If you mean the word you might call someone you love, it is chéri or chou.
a bee hive
Honey bees are already dying in large numbers world wide. There are many studies to find out why. -Extinction of the honeybee carries serious consequences for humanity. We depend not only on the honey for nourishment but more importantly on the bees themselves to pollinate many vital plants.