diff --git a/src/api.rs b/src/api.rs
new file mode 100644
index 0000000..24d7ff6
--- /dev/null
+++ b/src/api.rs
@@ -0,0 +1,12 @@
+use crate::types;
+
+pub async fn define(
+    word: &str,
+    language: &str,
+) -> Result<types::DictionarySearchResult, reqwest::Error> {
+    let url = format!(
+        "https://freedictionaryapi.com/api/v1/entries/{}/{}",
+        language, word
+    );
+    reqwest::get(url).await?.json().await
+}
diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..ecdac75
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,15 @@
+use crate::constants;
+
+use clap::Parser;
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+pub struct Args {
+    pub word: String,
+    #[arg(short, long, default_value = "en")]
+    pub language: String,
+    #[arg(short, long, default_values = constants::POSSIBLE_PARTS_OF_SPEECH)]
+    pub parts_of_speech: Vec<String>,
+    #[arg(short, long, action = clap::ArgAction::SetTrue)]
+    pub examples: bool,
+}
diff --git a/src/constants.rs b/src/constants.rs
new file mode 100644
index 0000000..849ea5b
--- /dev/null
+++ b/src/constants.rs
@@ -0,0 +1,13 @@
+pub static POSSIBLE_PARTS_OF_SPEECH: &[&str] = &[
+    "noun",
+    "verb",
+    "adjective",
+    "adverb",
+    "pronoun",
+    "preposition",
+    "conjunction",
+    "interjection",
+    "exclamation",
+    "determiner",
+    "article",
+];
diff --git a/src/main.rs b/src/main.rs
index 5a73661..90944ff 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,66 +1,15 @@
 use clap::Parser;
 use colored::Colorize;
-use serde::Deserialize;
 
-static POSSIBLE_PARTS_OF_SPEECH: &[&str] = &[
-    "noun",
-    "verb",
-    "adjective",
-    "adverb",
-    "pronoun",
-    "preposition",
-    "conjunction",
-    "interjection",
-    "exclamation",
-    "determiner",
-    "article",
-];
-
-#[derive(Parser, Debug)]
-#[command(version, about, long_about = None)]
-struct Args {
-    word: String,
-    #[arg(short, long, default_value = "en")]
-    language: String,
-    #[arg(short, long, default_values = POSSIBLE_PARTS_OF_SPEECH)]
-    parts_of_speech: Vec<String>,
-    #[arg(short, long, action = clap::ArgAction::SetTrue)]
-    examples: bool,
-}
-
-#[derive(Debug, Deserialize)]
-#[serde(rename_all = "camelCase")]
-struct DictionarySearchResult {
-    word: String,
-    entries: Vec<DictionaryEntry>,
-}
-
-#[derive(Debug, Deserialize)]
-#[serde(rename_all = "camelCase")]
-struct DictionaryEntry {
-    part_of_speech: String,
-    senses: Vec<DictionarySense>,
-}
-
-#[derive(Debug, Deserialize)]
-#[serde(rename_all = "camelCase")]
-struct DictionarySense {
-    definition: String,
-    examples: Vec<String>,
-}
-
-async fn define(word: &str, language: &str) -> Result<DictionarySearchResult, reqwest::Error> {
-    let url = format!(
-        "https://freedictionaryapi.com/api/v1/entries/{}/{}",
-        language, word
-    );
-    reqwest::get(url).await?.json().await
-}
+mod api;
+mod cli;
+mod constants;
+mod types;
 
 #[tokio::main]
 async fn main() {
-    let args = Args::parse();
-    let result = define(&args.word, &args.language).await;
+    let args = cli::Args::parse();
+    let result = api::define(&args.word, &args.language).await;
     if result.is_err() {
         panic!("Error: {}", result.err().unwrap());
     }
diff --git a/src/types.rs b/src/types.rs
new file mode 100644
index 0000000..86a62fa
--- /dev/null
+++ b/src/types.rs
@@ -0,0 +1,22 @@
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct DictionarySearchResult {
+    pub word: String,
+    pub entries: Vec<DictionaryEntry>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct DictionaryEntry {
+    pub part_of_speech: String,
+    pub senses: Vec<DictionarySense>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct DictionarySense {
+    pub definition: String,
+    pub examples: Vec<String>,
+}