Another word for fissure is "crack." Other synonyms include "split," "crevice," and "fracture," depending on the context in which it is used. Each of these terms conveys a sense of division or separation in a surface or structure.
Crevice, fissure
CREVASSE!
crevasse
I assume you mean hilus, which is when a fissure in the internal organs of the person.
"In anatomy, a fissure is a deep groove in any of various parts of the body." "The scientists were studying a deep fissure in the ocean floor." "Steam was erupting from a new fissure in the area of the geysers."
Aperture. Fissure. Celestial (space). Rift. Cosmos. Ether Space. Intersellar. Intercosmic. Metagalactic. "Ocean of emptiness". The Void.
A "fissure" is a crack or break in something. You might use the word "fissure' to describe a steep-sided canyon, something that looks like a crack in the mountain. You would not use "fissure" to describe the mountain itself.
The scientist discovered a deep fissure in the earth's surface, evidence of the tectonic plates shifting below.
Fissure
Fissure, fussier
The fissure gaped in front of me preventing me from going forward.
A long crack from which lava flows through is called a fissure. These fissures can be found along volcanic zones and can release lava during volcanic eruptions.