diff --git a/src/main.rs b/src/main.rs
index 7b9ff58..e4566a5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,14 +22,12 @@ mod repository;
 
 fn main() {
     match args::parse() {
-        Ok(x) => {
-            println!("Ok: {:?}", x);
-            if let Ok(_db) = repository::WordList::load() {
-                println!("Has db");
-            } else {
-                println!("Do not has db");
+        Ok(x) => match x {
+            actions::Action::AdjectiveAdd(word) => {
+                repository::WordList::insert_adjective(&word).unwrap();
             }
-        }
+            _ => unimplemented!(),
+        },
         Err(x) => println!("Error {:?}", x),
     }
 }
diff --git a/src/repository.rs b/src/repository.rs
index 97004d6..74975f2 100644
--- a/src/repository.rs
+++ b/src/repository.rs
@@ -1,13 +1,13 @@
 use std::collections::BTreeMap;
 use std::collections::LinkedList;
 use std::fs::File;
-use std::io::Read;
+use std::io::{Read, Write};
 
 use serde_derive::Deserialize;
 use serde_derive::Serialize;
 use toml;
 
-type WordStorage = BTreeMap<char, LinkedList<String>>;
+type WordStorage = BTreeMap<String, LinkedList<String>>;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct WordList {
@@ -15,8 +15,12 @@ pub struct WordList {
     metals: WordStorage,
 }
 
+#[derive(Debug)]
 pub enum WordListError {
     InvalidFormat,
+    InvalidWord,
+    WordAlreadyExists,
+    SaveFailure,
 }
 
 impl std::convert::From<std::io::Error> for WordListError {
@@ -31,6 +35,12 @@ impl std::convert::From<toml::de::Error> for WordListError {
     }
 }
 
+impl std::convert::From<toml::ser::Error> for WordListError {
+    fn from(_error: toml::ser::Error) -> WordListError {
+        WordListError::SaveFailure
+    }
+}
+
 impl WordList {
     /// Create an empty database
     fn empty() -> Self {
@@ -41,7 +51,7 @@ impl WordList {
     }
 
     /// Load the database
-    pub fn load() -> Result<Self, WordListError> {
+    fn load() -> Result<Self, WordListError> {
         if let Ok(mut fp) = File::open("database.toml") {
             let mut content = String::new();
             fp.read_to_string(&mut content)?;
@@ -51,4 +61,37 @@ impl WordList {
             Ok(WordList::empty())
         }
     }
+
+    /// Save the database
+    fn save(&self) -> Result<(), WordListError> {
+        let content = toml::to_string(&self).unwrap();
+        let mut fp = File::create("database.toml")?;
+        fp.write_all(content.as_bytes())?;
+        Ok(())
+    }
+
+    /// add an adjective to the word list
+    pub fn insert_adjective(adjective: &str) -> Result<(), WordListError> {
+        let mut repo = Self::load()?;
+        let initial = adjective
+            .chars()
+            .nth(0)
+            .ok_or(WordListError::InvalidWord)?
+            .to_string();
+        let mut list = if !repo.adjectives.contains_key(&initial) {
+            let empty_list = LinkedList::new();
+            empty_list
+        } else {
+            repo.adjectives.get(&initial).unwrap().to_owned()
+        };
+
+        if list.contains(&adjective.to_string()) {
+            Err(WordListError::WordAlreadyExists)
+        } else {
+            list.push_back(adjective.to_string());
+            repo.adjectives.insert(initial, list);
+            repo.save()?;
+            Ok(())
+        }
+    }
 }