Blocks
Fastnesses and blocks are semantically related. In some cases you can use "Fastnesses" instead a noun "Blocks".
Fastnesses
Blocks and fastnesses are semantically related. Sometimes you can use "Blocks" instead a noun "Fastnesses".
Mutual synonyms
Cite this Source
Fastnesses and Blocks. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/blocks/fastnesses
Blocks & Fastnesses. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/blocks/fastnesses>.
Fastnesses or Blocks. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/blocks/fastnesses.
Google Ngram Viewer shows how "blocks" and "fastnesses" have occurred on timeline