semantic network

DrugBank

"The DrugBank database is a unique bioinformatics and cheminformatics resource that combines detailed drug (i.e. chemical, pharmacological and pharmaceutical) data with comprehensive drug target (i.e. sequence, structure, and pathway) information. The database contains 8246 drug entries including 2012 FDA-approved small molecule drugs, 229 FDA-approved biotech (protein/peptide) drugs, 94 nutraceuticals and over 6000 experimental drugs. Additionally, 4344 non-redundant protein (i.e. drug target/enzyme/transporter/carrier) sequences are linked to these drug entries.

Wikidata

"Wikidata is a free linked database that can be read and edited by both humans and machines. Wikidata acts as central storage for the structured data of its Wikimedia sister projects including Wikipedia, Wikivoyage, Wikisource, and others. Wikidata also provides support to many other sites and services beyond just Wikimedia projects! The content of Wikidata is available under a free license, exported using standard formats, and can be interlinked to other open data sets on the linked data web."

WordNet

"WordNet® is a large lexical database of English. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations. The resulting network of meaningfully related words and concepts can be navigated with the browser. WordNet is also freely and publicly available for download. WordNet's structure makes it a useful tool for computational linguistics and natural language processing.

Visuwords™

"Enter words into the search box, "visualize a word," to look them up. Touch a node to see the definition of that word group and click and drag individual nodes to move them around to help clarify connections.

It's a dictionary! It's a thesaurus!
Great for writers, journalists, students, teachers, and artists.
The online dictionary is available wherever there’s an internet connection.
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Roget's Thesaurus

"Roget's Thesaurus is composed of six primary classes. (...) Each class is composed of multiple divisions and then sections. This may be conceptualized as a tree containing over a thousand branches for individual 'meaning clusters' or semantically linked words. Although these words are not strictly synonyms, they can be viewed as colours or connotations of a meaning or as a spectrum of a concept. One of the most general words is chosen to typify the spectrum as its headword, which labels the whole group.

Semantischer Netzwerk Service

"Der Semantische Netzwerk Service (SNS) des Umweltbundesamts bietet Unterstützung bei der Anwendung einer gemeinsamen Umwelt-Terminologie einschließlich der dort gebräuchlichen geographischen Namen.
SNS beinhaltet ein zweisprachiges fortlaufend aktualisiertes semantisches Netz (deutsch/englisch), das aus drei Komponenten besteht:
- Umweltthesaurus UMTHES mit über 55.000 untereinander vernetzten Begriffen (Deskriptoren und Nicht-Deskriptoren) plus 25.000 englischen Benennungen.

"The Semantic Network Service (SNS) of the Federal Environment Agency provides support for all questions concerning environmental terms including the common place names. (...) SNS contains a bi-lingual (German/English) semantic network which consists of three components:
- the Environmental Thesaurus UMTHES® with more than 50,000 inter-networked terms. (Descriptors and Non-Descriptors).
- the Geo-Thesaurus-Environment (GTU) with more than 25,000 geographic names and the spatial intersections of all these places.