one of polygons
| SQUARE |
| DECAGON |
| HEXAGON |
| NONAGON |
| OCTAGON |
| RHOMBUS |
| PENTAGON |
| RHOMBOID |
| TRIANGLE |
| RECTANGLE |
| TRAPEZOID |
| PARALLELOGRAM |
| QUADRILATERAL |
List of words for the clue one of polygons from the crossword:
SIDED SIDES SHAPES ERA OPERA ARIA ACE