Main Difference
The main difference between Oval and Ovular is that the Oval is a shape and Ovular is a plant structure and its female reproductive cells.
Oval
An oval (from Latin ovum, “egg”) is a closed curve in a plane which “loosely” resembles the outline of an egg. The term is not very specific, but in some areas (projective geometry, technical drawing, etc.) it is given a more precise definition, which may include either one or two axes of symmetry. In common English, the term is used in a broader sense: any shape which reminds one of an egg. The three-dimensional version of an oval is called an ovoid.
Ovular
In seed plants, the ovule (“small egg”) is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integument(s), forming its outer layer(s), the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center. The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell (or several in some groups) for the purpose of fertilization.
Oval (noun)
A shape rather like an egg or an ellipse.
Oval (noun)
A sporting arena etc. of this shape.
Oval (noun)
In a projective plane, a set of points, no three collinear, such that there is a unique tangent line at each point. (A tangent line is defined as a line meeting the point set at only one point, also known as a 1-secant.)
Oval (adjective)
Having the shape of an oval.
Oval (adjective)
Of or pertaining to an ovum.
“oval conceptions”
Ovular (adjective)
Of or pertaining to an ovule.
Ovular (noun)
A seminar for feminists.
Oval (adjective)
having a rounded and slightly elongated outline or shape like that of an egg
“her smooth oval face”
Oval (noun)
a body, object, or design with an oval shape or outline
“cut out two small ovals from the felt”
Oval (noun)
an oval sports field or racing track.
Oval (noun)
a ground for Australian Rules football.