Tectiform refers to a shape or structure resembling a roof or tent. There are several synonyms that can be used interchangeably for the word tectiform. For example, the term 'pyramidal' describes something that resembles a pyramid or has a sloping form. 'Conical' refers to a shape that resembles a cone, while 'apex' is used to describe the top or highest point of a structure or shape. Similarly, 'domed' refers to a form with a rounded top, while 'vaulted' is used to describe a ceiling or roof designed with arches. All these words are synonyms for tectiform and can be used to describe various structures that tend have a tent-like or pointed shape.