Despite the extensive research on bilingual development, our understanding of how lexical competition unfolds in the bilingual mind remains limited. Previous studies have predominantly focused on crosslinguistic competition, neglecting the examination of the competition process within each language and the influence of diverse bilingual experiences, such as first language attriters, heritage speakers, or sequential bilinguals. Consequently, there is a critical gap in our knowledge regarding how bilinguals navigate and resolve competition dynamics during spoken word recognition in the context of language attrition. We compare the within-L1 and within-L2 competition mechanisms of Spanish-English attriters (N = 65) with two monolingual control groups (Spanish and English speakers). Participants completed two visual world tasks with manipulation of onset/rhyme overlap. Results indicate a contrast between the competition mechanisms exhibited by the L1 monolingual group and the Spanish attriters during L1 spoken word recognition. Our findings highlight the role of bilingual experiences in modulating L1 competition dynamics, shedding light on the complex relationship between bilingualism and lexical competition.