This study analyzes four English synonyms -- clear, obvious, apparent, and evident -- concentrating on meanings, distribution across genre, collocations, and semantic preference and prosody. The data were drawn from learner's dictionaries and the Corpus of the Contemporary American English (COCA). It was discovered that the four synonyms share the same core meaning but differ in terms of detailed meanings, collocations, semantic preference, and semantic prosody. "Apparent" and "evident" were found to be the most formal synonyms in this study. "Obvious" is mostly associated with negative meanings. "Clear" has a wide range of detailed meanings and is usually involved with nature and the physical world. The results of this study also shed light on ELT as they can guide teachers and students in practicing skills of corpora and applying them to classroom, autonomously.