The helicopter just landed in the heliport.
heliport
lets stop at the heliport first before lunch
The word 'heliport' is a singular, common, concrete noun; a word for a place designed for helicopters to land and take off. The noun heliport is not a compound noun because 'heli-' is not a word, it is a prefix.
I am not writing a sentence using that word.
a sentence using the word endotracheal
This is a sentence using the word aviator.
I am saying a sentence using the word collagen.
this is a sentence using the word armchair.
Please type a sentence using the word assertion.
Sean was horrified when, the day before his first big high school dance, he looked in the mirror and saw that he had a large zit that looked like a crater on his face.
When Scott forgot to set his alarm clock, he overslept and didn’t have time to eat breakfast before the school bus came.
I can write a sentence using the word scorn!