Depending on how you use it, another word for it could be vertex, like in an isosceles triangle, or peak, if used in a pyramid.
Atom apex =D
atom APEX Is Hard
Another word that means the same is "synonym." A synonym is a word that has the same or nearly the same meaning as another word. For example, "happy" and "joyful" are synonyms.
The word 'unite' means close to the same thing as annex does.
promote
Top, apex, are two possibilities.
Atom apex =D
the word root plac means "to please."
apex, acme
atom APEX Is Hard
The word "reply" means the same as respond.
with the same meaning :)APEX
Bio-, which means "life" APEX:)
Prejudice (APEX)
Surprised almost means the same as startled.
"Similar" is a word that means nearly the same as "like."
No, the word apical is an ajective. It means pertaining to an apex or point. (The similar word epochal is also an adjective.)