Montgomery Ward added a "shadow anchor" to the periphery of the mall in August 1972. At the time, the 95,800 square foot store was the chain's largest New England location.
Drawing from the Montgomery Ward Company

For several years, the primary retail rival of NASHUA MALL & PLAZA was ROYAL RIDGE MALL, a twenty-store mini mall on the southeast side of the city. Originally anchored by Marshalls, a Purity Supermarket and Pharmacity Super Drugette, ROYAL RIDGE MALL opened for business in May 1974. 20 years later, it was redeveloped as ROYAL RIDGE CENTER, a six-store power plaza.
Graphic from The Nashua Telegraph