Digitspeech

Digitspeech is an Augmentative and Alternative Communication (AAC) app that allows you to say words by pressing buttons. It is designed to help people who have problems speaking clearly (elderly, children with development disorders). Speech is done with Apple's text-to-speech, so any word that is added can be spoken (26 languages are supported).
There is a keyboard typing page where sentences can be written and then produced aloud. These new words/utterances are also saved and can be accessed with a button press on the main page.
The settings page allows you to edit the words and their order. Emoji can provide some visual support for particular words. Button size is very important for people with movement difficulties, so the size of the buttons can be set by selecting the number of columns. And you can select the language that is used for speech. There is a limit of 10 words in the free version of the app, but if you purchase the license in the Store page, then you can add any number of words. Also, the license will allow you to save your words and settings, so that you get the same setup if you reboot the device. With the free version, you can use your 10 words with the columns and language settings for as long as you want.
The app can also be useful for second language learning, where you can press buttons to hear words in the second language spoken aloud. You can put a colon in the name of the button and the system will only produce the part before the colon. For example with French selected as the language, then pressing a button "Bonjour: Hello" would yield only "Bonjour" spoken aloud.