| energy |
the power or ability to make something work or be active. [1/3 definitions] |
| extinct |
no longer active or burning. [1/2 definitions] |
| fly2 |
an insect with two wings. Most flies are active in the daytime, and many have large eyes. Mosquitoes and houseflies are among the thousands of types of flies. |
| full of beans |
(informal) full of energy; very active. [1/2 definitions] |
| horse around |
to play in a silly or foolish way; to be very active. |
| hyperactive |
very active or stimulated beyond what is normal. |
| idle |
not active or in use; not working. [1/6 definitions] |
| imaginative |
having or showing an active or good imagination. |
| industrious |
working hard; producing in an active way. |
| in effect |
in active operation. |
| landform |
a natural part of the earth like a hill, mountain, canyon or island. A landform has been made by forces that are active inside the earth or around the earth. |
| lemur |
a small, furry mammal with large, round eyes and a long tail. They are active mainly at night. Lemurs are found in Madagascar, a large island country near the eastern coast of Africa, and in nearby islands. |
| live1 |
to have life; be in an active state. [1/4 definitions] |
| magnetic field |
the space around a magnet in which a magnetic force is active. |
| nocturnal |
active at night. [1/2 definitions] |
| nucleus |
the central, essential, or most active part around which other parts are grouped. [1/3 definitions] |
| owl |
a bird with large eyes set in front of a large head, a strong, hooked beak, and strong, sharp claws. Owls are most active at night and hunt other animals for food. There are many different kinds of owls. |
| play |
to be active in a game or contest. [1/8 definitions] |
| promotion |
active support; backing. [1/3 definitions] |
| reserve |
(plural) members of the armed forces who are not on active duty but can be called in to help during emergencies. [1/6 definitions] |
| retired |
having stopped working at one's job or no longer being in active service. |