A corpus-based analysis of English synonyms cheap, inexpensive and affordable

This corpus-based study investigates the similarities and differences among the three synonymous adjectives cheap, inexpensive, and affordable, with a focus on two primary linguistic terms, which are degree of formality and noun collocations in association with semantic preference. Definitions and sample usages were extracted from the Oxford Advanced American Dictionary (OAAD) and the Longman Dictionary of Contemporary English (LDOCE), while real-world language data were collected from the Corpus of Contemporary American English (COCA), which provides genre based distribution across eight different genres. The findings present major differences both in terms of frequency of usage and use context. Cheap, for example, occurs in informal genres, such as blogs, web content, and spoken language, often with negative implications of low quality or unrespectability. On the other hand, inexpensive and affordable are more frequent in formal genres, such as academic writing and news articles, with inexpensive typically appearing in neutral or positively evaluated contexts and affordable conveying in the domain of financial affordability, especially in housing, medicine, and education. Semantic and collocational analyses further reveal that these adjectives belong to distinct thematic domains. Therefore, although all three adjectives broadly convey the idea of low cost, their nuanced connotations, collocational patterns, and levels of formality indicate that they are not fully interchangeable. Careful selection based on context and communicative intent is essential.