The plural of journey is journeys.
A journey refers to the act of traveling from one place to another, usually over a considerable distance. It involves a process or experience of moving, exploring, or embarking on a specific trip or adventure.
The correct plural form of the word "journey" is "journeys." Although "journies" may seem like a logical pluralization, it is not accepted or recognized in standard English usage.
Nouns ending in a vowel + -y form their plural by simply adding -s to the end of the word. This is why the plural of journey is journeys and not journies.
The word "journey" is considered a countable noun. Countable nouns are objects or entities that can be counted as separate units or individuals. Each journey represents a distinct travel experience or specific trip, and its plural form "journeys" reflects this countability.
You can use numerical quantifiers such as "one journey," "two journeys," "three journeys," and so on to specify the quantity of journeys.
Countable nouns have both singular and plural forms and can be used with articles like "a" or "an" for singular nouns and "the" for plural nouns. For example, you would say "a journey" when referring to a single travel experience and "the journeys" when referring to multiple trips or adventures.
In English, there isn't a widely recognized specific collective noun dedicated to a group of journeys. However, you can use the term "collection" or "series" to refer to a group of journeys that share a common theme, purpose, or destination. These terms can convey the idea of multiple journeys being grouped or connected in some way.
For example, you could say "a collection of journeys exploring ancient civilizations" or "a series of journeys through remote wilderness areas."
The graph shows the occurances of the plural of journey in written English since 1800 using Google's Ngram Viewer.
Sources:
https://www.collinsdictionary.com/dictionary/english/journey