gerontocracy- government ruled by old people.

Example: In contrast to India’s gerontocracy, there is a worldwide trend for having young leaders.

My own: The future society included a gerontocracy and absurd age rules for holding jobs or governmental posts.

 

Heterogeneous- diverse in character or content.

 

Example: Its population, then as at the present day, was a heterogeneous collection of all races.

 

My own: The rainforest has a heterogeneous collection of birds.

 

Catalyst- substance that causes speeding up

 

Example: His belligerent attitude toward car driving became the catalyst for this thought-provoking drama.

 

My own: The personal differences between the friends became to the catalyst for the end of their friendship.

 

Ameliorate- improve; make better

 

Example: She wanted to ameliorate the situation.

 

My own: Throwing rubbish into rubbish bins would ameliorate the current situation of community.

 

Ossified- turned to bone; hardened like bone; inflexible

 

Example: No batrachian is known to possess an ossified azygous supraoccipital.

 

My own: No invertebrate is known for having any bone or anything ossified.