I tend to refer to arrays as having elements, structures as having members and lists as having items (I can't guarantee that I have been consistent in the BBC BASIC documentation; if you do notice a departure from this usage please tell me).
I asked DeepSeek whether this was reasonable, and it replied that it was (!). But it suggested a more precise classification:
- Elements for anything indexable.
- Members for things with a name.
- Items for unordered collections.
Other similar terms which may be encountered are fields (common in databases), nodes (common in linked-lists) and values (common in dictionaries, especially in the context of key-value pairs).