Obtuse, octagon, odd number, one and oval are math terms. They begin with the letter o.
ode is a lyrical poem
Oath of fealty is a middle ages term. It begins with the letter O.
Operations
Lions can be described as overpowering. The word starts with the letter o.
Omelette au fromage is a Swiss dish that starts with the letter O.
A machine that starts with O is an oscillating fan.
an octopus is a simple machine that starts with a o
Oman is the only country that starts with O.
what ia letter that starts with the letter o and has to do with world war 2
Onomatopoeia is a language arts term. It is the use of words such as meow or buzz. The sound of the word suggests its meaning.
The orb spider is an arthropod that begins with the letter o.
The omentum starts with the letter O