There are several synonyms that can be used for the phrase "lay first stone." Some of these include "commence," "initiate," "begin," "start," "launch," "embark," "pioneer," and "inaugurate." Each of these words carries the same basic meaning of starting a project or venture, but with subtle differences in tone and context. For example, "commence" suggests a formal and deliberate start, while "embark" implies a sense of adventure or risk-taking. Using synonyms for "lay first stone" can help add variety and impact to your writing while keeping the same essential meaning.