The main difference between Clover and Shamrock is that the Clover is a genus of plants and Shamrock is a clover symbol
Clover or trefoil are common names for plants of the genus Trifolium (Latin, tres “three” + folium “leaf”), consisting of about 300 species of flowering plants in the legume or pea family Fabaceae. The genus has a cosmopolitan distribution with highest diversity in the temperate Northern Hemisphere, but many species also occur in South America and Africa, including at high altitudes on mountains in the tropics. They are small annual, biennial, or short-lived perennial herbaceous plants. Clover can be evergreen. The leaves are trifoliate (rarely quatrefoiled; see four-leaf clover), cinquefoil, or septfoil, with stipules adnate to the leaf-stalk, and heads or dense spikes of small red, purple, white, or yellow flowers; the small, few-seeded pods are enclosed in the calyx. Other closely related genera often called clovers include Melilotus (sweet clover) and Medicago (alfalfa or Calvary clover).
A shamrock is a young sprig, used as a symbol of Ireland. Saint Patrick, Ireland’s patron saint, is said to have used it as a metaphor for the Christian Holy Trinity. The name shamrock comes from Irish seamróg [ˈʃamˠɾˠoːɡ], which is the diminutive of the Irish word seamair óg and simply means “young clover”.Shamrock usually refers to either the species Trifolium dubium (lesser clover, Irish: seamair bhuí) or Trifolium repens (white clover, Irish: seamair bhán). However, other three-leaved plants—such as Medicago lupulina, Trifolium pratense, and Oxalis acetosella—are sometimes called shamrocks. The shamrock was traditionally used for its medicinal properties and was a popular motif in Victorian times.
A plant of the genus Trifolium with leaves usually divided into three (rarely four) leaflets and with white or red flowers.
The second Lenormand card, representing hope, optimism and short-term luck.
The trefoil leaf of any small clover, especially noshow=1, or such a leaf from a clover-like plant, commonly used as a symbol of Ireland.
“She wore a shamrock in honor of her Irish ancestry.”
Any of several small plants, forms of clover, with trefoil leaves, especially Trifolium repens.
“The fields were covered with shamrocks.”