Yes, Xodo is a PDF editor, but it is not a word-processor (like Word or Google Docs).

Examples of currently supported editing operations:

• Create/edit/delete annotations.  
• Insert/delete/rotate/move/crop pages.
• Insert/edit bookmarks.
• Merge PDFs.
• Convert image, text, office, and other formats to PDF.
• Fill-in and edit PDF forms .  
• Add blank pages, place images, text/notes, and scribbles.
• Sign documents.  
• Reduce file size and optimize existing PDF documents.
• Flatten forms, signatures, and annotations so that they are not 'editable'.
• Encrypt or remove PDF security on existing documents
• and much more

Due to the nature of the PDF file format (a fixed page document missing a universal semantic structure), there is no app that can reliably edit PDF documents in a manner similar to a word-processor. Some apps may claim (or appear) to work in very basic cases, however there is no reliable or a general purpose solution. Also we don't expect that this will change in the near future.